test-pwd-strength/index.js

[](https://www.npmjs.com/package/password-strength-checker) [](https://opensource.org/licenses/MIT)

/**
 * Check password strength based on customizable rules.
 * @param {string} password - The password to check.
 * @param {object} options - Configuration options.
 * @returns {object} - Strength result (score, feedback, etc.).
 */
function checkStrength(password, options = {}) {
  const defaults = {
    minLength: 8,
    requireUppercase: true,
    requireNumbers: true,
    requireSymbols: true,
  };
  const config = { ...defaults, ...options };
  const feedback = [];
  let score = 0;

  // Length check (max 30 points)
  const lengthPoints = Math.min(30, Math.floor(password.length / 8 * 30));
  score += lengthPoints;
  if (password.length < config.minLength) {
    feedback.push(`Password must be at least ${config.minLength} characters.`);
  }

  // Character type checks (only if required)
  if (config.requireUppercase) {
    if (/[A-Z]/.test(password)) {
      score += 20;
    } else {
      feedback.push('Add at least one uppercase letter.');
    }
  }

  if (config.requireNumbers) {
    if (/[0-9]/.test(password)) {
      score += 20;
    } else {
      feedback.push('Add at least one number.');
    }
  }

  
  if (config.requireSymbols) {
    if (/[!@#$%^&*(),.?":{}|<>]/.test(password)) {
      score += 30;
    } else {
      feedback.push('Add at least one symbol.');
    }
  }
  
  if (!feedback.length) {
    feedback.push('The password looks perfect.');
  }

  // Strength thresholds
  let strength;
  if (score >= 80) strength = 'strong';
  else if (score >= 50) strength = 'medium';
  else strength = 'weak';

  return { score, strength, feedback };
}

module.exports = { checkStrength };